此外，直接接插市售丁烷气罐还可构成简便双头焊枪。
In addition, the commercial butane gas tank inserted directly can compose the convenient double-head welding gun.
目前，正丁烷脱氢异构催化剂可以分为两类，过渡金属双功能催化剂和过渡金属氮化物、 碳化物和碳氧化物催化剂。
The catalysts on studying can divide into two kinds: the transition metal bifunctional catalysts and the nitride, carbide and oxycarbide catalysts of transition metals.
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